So I might be able to offer some helpful advice here, might seem obvious to the experience runners but I completed my first run yesterday with 37Mill payout at the end of it and this is what I would recommend to anyone starting out on these runs.
So far everyone has focused on the large stations and going point to point but I included the small port which is 5000LS away from the main star so my route would consist of the following:- CEOS (NEW DAWN STATION) > SOTHIS (NEWHOLM STATION) > SOTHIS (SOTHIS MINING PORT) then repeat...
The reason being is that to start with your faction is going to be very low and naturally the mission payouts will be okay but not high end like some of these pro's are running, so you will naturally have to spend more time mode switching and refreshing the board for missions. This port offers excellent delivery missions of mining materials back to both these main stations, sometimes low quantities of 30T with a 1 million payout, these little mission will seriously bolster your cash pot and build up your rankings.
To give you an example I made made between 6-8 Million in about 2 hours just jumping between these stations which (no offence intended) at your level is a lot of money and will go along way with your ship upgrades, remember that this is a huge benefit to being in a smaller ship that can land at ports.
My only reservation about you using the ASP EX is you do not have enough funds to maximise the jump capability and the fuel scoop which can be very expensive.
I would personally recommend you sell your ASP for starters and go by a TYPE - 6, I have built you what I think is a viable little ship for this, it will achieve 100T cargo capacity, have an impressive boost to out run anything that attacks you (you must run....) and it will cost you a total of 3Million.
It might seem like a lot but that little ship has got just over 30LY range empty and a quality 20LY once it's fully loaded, lots of the pro's on here use those little runners. I have linked you the link below...
So lets have a look at the ship build for you here:-
https://coriolis.io/outfit/type_6_t...ds8f4--0007070404030343012r.Iw1-kA==.Aw1-kA==
To start with your main focus will be to work between the three stations and build up faction rating and credits.
As you are doing this there will be long haul missions pop up over 400LY away, the trick here is not to get over excited and accept the first one you see and find a balance between how much time you want to spend looking for the "perfect" missions and just hauling because there is a point if you spend too much time at the station your not doing the long run.
Look at the total value payout from the mission like this, haul 80T of cargo 400 LY's for 4,567,876Cedits this works out your earning 57,000Credits / tonnes profit
Then another mission might say okay 50 T of cargo for 3,678,985 and your now earning 73,570Credits / tonnes. Find a balance that your looking for but I used the advice from the other guys on this forum and you should be aiming for around 15 - 30 Millions for about 100T of cargo capacity!!
Try not to look at this like a one stop grind, take your time when looking through the stations, you are earning lots of cash, whilst building up your federation ranking and also improving your Trading rank whilst earning good engineering mats ... I hope this was of some help to you and don't forget to post and let us know how you get on!!
Safe Flying 07
DRAKUS21
) so i kitted it out with the best of everything (in li yong rui territory so it was cheaper), added an Adv DS and even a little extra fuel. Getting almost 25LY max jump and about 16ish i thnk loaded. Seems to be doing the business so far. 
